package 链表;

public class ListNode {
        int val;
        ListNode next;

        ListNode() {
        }

        ListNode(int val) {
            this.val = val;
        }

    @Override
    public String toString() {
        return "ListNode{" +
                "val=" + val +
                ", next=" + next +
                '}';
    }

    ListNode(int val, ListNode next) {
            this.val = val;
            this.next = next;
        }
    }